What were the three discoveries Galileo made with his telescope observations and quickly published into Sidereus Nuncius?
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First, the moon was not perfect. It had mountains and valleys on its surface, and Galileo even used some of the mountains' shadows to calculate their height.
Second, the Milky Way was made up of myriad stars too faint to see with the unaided eye.
Third, four new "planets" circling Jupiter, objects known today as the Galilean moons of Jupiter.
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The Hall effect can be used to do all of the following EXCEPT
A player kicks a soccer ball in a high arc toward the opponent's goal. At the highest point in its trajectory
A) both the velocity and the acceleration of the soccer ball are zero. B) neither the ball's velocity nor its acceleration are zero. C) the ball's acceleration is zero but its velocity is not zero. D) the ball's acceleration points upward. E) the ball's velocity points downward.
How are asteroid masses measured?
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The radius of the n = 3 Bohr orbit in the hydrogen atom is
A) 0.36 nm. B) 0.60 nm. C) 0.48 nm. D) 0.12 nm. E) 0.24 nm.